[ad#review1050-top]If you have an iPhone you know that the battery life is horrible! Even if you are casual user that might access the GPS and internet every once in a while it seems like the battery drains so quickly when using those services. This is where the PowerDuo Reserve comes in. It is basically Griffin’s PowerBlock Reserve and PowerJolt Reserve in one! You get a reserve battery that fits both included PowerBlock and PowerJolt. So you can charge the battery and your iPhone at the same time where ever you are! Let’s check it out!